[SIP-4] add lerna monorepo and@superset-ui/core package with SupersetClient

.gitignore

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+# Logs
+logs/
+*.log
+
+# Cache
+.eslintcache
+.idea
+.npm
+.yarnclean
+
+# Directories
+coverage/
+esm/
+lib/
+build/
+node_modules/
+_gh-pages/
+
+# Custom
+*.min.js
+*.map
+
+# Configs, these are auto-generated by beemo and should therefore be ignored
+.babelrc
+.eslintignore
+.eslintrc.js
+.prettierignore
+jest.config.js
+prettier.config.js
+# @TODO webpack.config.js when this driver is added

PULL_REQUEST_TEMPLATE.md

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+💔 Breaking Changes
+
+🏆 Enhancements
+
+📜 Documentation
+
+🐛 Bug Fix
+
+🏠 Internal

README.md

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+# `@superset-ui`
+
+Collection of packages that power the Apache Superset UI, and can be used to craft custom data
+applications that leverage a Superset backend :chart_with_upwards_trend:
+
+## Packages
+
+[@superset-ui/core](https://github.com/apache-superset/superset-ui/tree/master/packages/superset-ui-core)
+[![Version](https://img.shields.io/npm/v/@superset-ui/core.svg?style=flat)](https://img.shields.io/npm/v/@superset-ui/core.svg?style=flat)
+
+#### Coming :soon:
+
+- Data providers
+- Embeddable charts
+- Chart collections
+- Demo storybook package
+
+### Development
+
+[lerna](https://github.com/lerna/lerna/) is used to manage versions and dependencies between
+packages in this monorepo.
+
+```
+superset-ui/
+  lerna.json
+  package.json
+  ...
+  packages/
+    package1/
+      package.json
+      ...
+      src/
+      test/
+      ...
+      lib/
+      esm/
+      ...
+    ...
+```
+
+For easiest development
+
+1. clone this repo
+2. install the root npm modules including lerna and yarn
+3. have lerna install package dependencies and manage the symlinking between packages for you
+
+```sh
+git clone ...superset-ui && cd superset-ui
+npm install
+lerna bootstrap
+```
+
+### Builds, linting, and testing
+
+Each package defines its own build config, linting, and testing. You can have lerna run commands
+across all packages using the syntax `lerna exec test` from the root `@superset/monorepo` root
+directory.
+
+### License
+
+Apache-2.0

lerna.json

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+{
+  "lerna": "3.2.1",
+  "packages": ["packages/*"],
+  "version": "0.0.0"
+}

package.json

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+{
+  "name": "@superset-ui/monorepo",
+  "version": "0.0.0",
+  "description": "Superset UI",
+  "private": true,
+  "scripts": {
+    "build": "lerna run build",
+    "jest": "lerna run test",
+    "lint": "lerna run lint",
+    "prerelease": "yarn run build",
+    "prepare-release": "git checkout master && git pull --rebase origin master && yarn run test",
+    "release": "yarn run prepare-release && lerna publish && lerna run gh-pages",
+    "test": "lerna bootstrap && yarn run lint && yarn run jest"
+  },
+  "repository": "https://github.com/apache-superset/superset-ui.git",
+  "keywords": [
+    "apache",
+    "superset",
+    "data",
+    "analytics",
+    "analysis",
+    "visualization",
+    "react",
+    "d3",
+    "data-ui",
+    "vx"
+  ],
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "lerna": "^3.2.1",
+    "yarn": "^1.9.4"
+  },
+  "engines": {
+    "node": ">=8.10.0"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}

packages/superset-ui-core/README.md

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+## `@superset-ui/core`
+
+[![Version](https://img.shields.io/npm/v/@superset-ui/core.svg?style=flat)](https://img.shields.io/npm/v/@superset-ui/core.svg?style=flat)
+
+Core modules for Superset:
+
+- `SupersetClient` requests and authentication
+- (future) `i18n` locales and translation
+
+### SupersetClient
+
+The `SupersetClient` handles all client-side requests to the Superset backend. It can be configured
+for use within the Superset application, or used to issue `CORS` requests in other applications. At
+a high-level it supports:
+
+- `CSRF` token authentication
+  - queues requests in the case that another request is made before the token is received
+  - it checks for a token before every request, an external app that uses this can detect this by
+    catching errors, or explicitly checking `SupersetClient.isAuthorized()`
+- supports `GET` and `POST` requests (no `PUT` or `DELETE`)
+- timeouts
+- query aborts through the `AbortController` API
+
+#### Example usage
+
+```javascript
+// appSetup.js
+import { SupersetClient } from `@superset-ui/core`;
+// or import SupersetClient from `@superset-ui/core/lib|esm/SupersetClient`;
+
+SupersetClient.configure(...clientConfig);
+SupersetClient.init(); // CSRF auth, can also chain `.configure().init();
+
+// anotherFile.js
+import { SupersetClient } from `@superset-ui/core`;
+
+SupersetClient.post(...requestConfig)
+  .then(({ request, json }) => ...)
+  .catch((error) => ...);
+```
+
+#### API
+
+##### Client Configuration
+
+The following flags can be passed in the client config call
+`SupersetClient.configure(...clientConfig);`
+
+- `protocol = 'http'`
+- `host`
+- `headers`
+- `credentials = 'same-origin'` (set to `include` for non-Superset apps)
+- `mode = 'same-origin'` (set to `cors` for non-Superset apps)
+- `timeout`
+
+##### Per-request Configuration
+
+The following flags can be passed on a per-request call `SupersetClient.get/post(...requestConfig);`
+
+- `url` or `endpoint`
+- `headers`
+- `body`
+- `timeout`
+- `signal` (for aborting, from `const { signal } = (new AbortController())`)
+- for `POST` requests
+  - `postPayload` (key values are added to a `new FormData()`)
+  - `stringify` whether to call `JSON.stringify` on `postPayload` values
+
+##### Query aborting
+
+Query aborting is implemented through the `AbortController` API:
+
+```javascript
+import { SupersetClient } from '@superset-ui/core';
+import AbortController from 'abortcontroller-polyfill';
+
+const controller = new AbortController();
+const { signal } = controller;
+
+SupersetClient.get({}).then(...).catch(...);
+
+if (IWantToCancelForSomeReason) {
+  signal.abort(); // Promise is rejected, request `catch` is invoked
+}
+```
+
+### Development
+
+`@data-ui/build-config` is used to manage the build configuration for this package including babel
+builds, jest testing, eslint, and prettier.

packages/superset-ui-core/package.json

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+{
+  "name": "@superset-ui/core",
+  "version": "0.0.0",
+  "description": "Superset UI core 🤖",
+  "sideEffects": false,
+  "main": "lib/index.js",
+  "module": "esm/index.js",
+  "files": [
+    "esm",
+    "lib"
+  ],
+  "scripts": {
+    "build:cjs": "beemo babel ./src --out-dir lib/ --minify",
+    "build:esm": "beemo babel ./src --out-dir esm/ --esm --minify",
+    "build": "yarn run build:cjs && yarn run build:esm",
+    "dev": "beemo babel --watch ./src --out-dir esm/ --esm",
+    "jest": "beemo jest --color --coverage",
+    "eslint": "beemo eslint \"./{src,test}/**/*.{js,jsx,json,md}\"",
+    "lint": "yarn run prettier --write && yarn run eslint --fix",
+    "test": "yarn run jest",
+    "prettier": "beemo prettier \"./{src,test}/**/*.{js,jsx,json,md}\"",
+    "sync:gitignore": "beemo sync-dotfiles --filter=gitignore",
+    "prepublish": "yarn run build"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/apache-superset/superset-ui.git"
+  },
+  "keywords": [
+    "superset",
+    "client",
+    "core",
+    "data"
+  ],
+  "author": "",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/apache-superset/superset-ui/issues"
+  },
+  "homepage": "https://github.com/apache-superset/superset-ui#readme",
+  "devDependencies": {
+    "@data-ui/build-config": "0.0.10",
+    "fetch-mock": "^6.5.2"
+  },
+  "dependencies": {
+    "url-search-params-polyfill": "^4.0.1",
+    "whatwg-fetch": "^2.0.4"
+  },
+  "beemo": {
+    "module": "@data-ui/build-config",
+    "drivers": [
+      "babel",
+      "eslint",
+      {
+        "driver": "jest",
+        "env": {
+          "NODE_ENV": "test"
+        }
+      },
+      "prettier"
+    ],
+    "eslint": {
+      "rules": {
+        "prefer-promise-reject-errors": "off"
+      }
+    },
+    "jest": {
+      "testPathIgnorePatterns": [
+        "node_modules"
+      ]
+    }
+  }
+}